Rainfall & harvesting
Rainfall volume calculator
Convert a rainfall depth over an area into a volume — the calculation behind every catchment yield estimate.
Result
Volume
2,500litres
In cubic metres
2.50m³
In imperial gallons
550gal
Roughly
29 baths
The rule
1 mm over 1 m² = 1 litre
This exact relationship is why rainfall is measured as a depth.
Method
Volume = depth × area. One millimetre of rain over one square metre is exactly one litre, which makes the arithmetic simple in metric units.